Oh boy, the ants are trouble right now. We were bitten terribly yesterday. DE might work on some ants. I've had relatively good luck with DE during the drier times of year on smaller species of ants, but with this humidity the effectiveness of DE will be greatly diminished (it works best at humidity levels lower than 65%). Once it gets wet it is completely ineffective. I had very mixed luck with leaf-cutter ants. I killed two of three colonies with DE earlier this spring. The two colonies that succumbed I managed to hit right as they emerged this spring and they never recovered. The third (and larger) colony has suffered greatly, but they still carry on. If they are in the coop near chicks I'd probably go nuclear on them and use an ant killer like this that the chickens can't easily get into. I also just found a box of Borax, which I have yet to try. It's supposed to work well with less of a toxic risk compared to the proprietary ant killers. I'll let you know how it works.
I've been using Diatomaceous Earth mixed with a little Garden and Poulty Dust. It's deadly on them. I put it at all the places they come through. I have a video of then, I have no idea of how to down load it. I put about a teaspoon dust to cup of DE.
i watch my aloha 2 month olds while they walk across the top of my 6ft fence, i worry that one day they will hop over to the neighbors - VACANT - yard, which at the moment still has green grass. In my experience, when pullets get old enough to fall in love with my giant brahma rooster (who can barely fly to the 2 ft high roost) they dont leave him, they lose all interest in the neighbors yards, lol
i have put DE in the nesting material to cut down on ant invasions. i read that it doesnt kill ants, but it irritates them and they try to avoid it. you can also put a barrier of DE around the run to discourage them coming in. i had one bad colony last year and had to keep my chickens locked up and put out ant bait stakes, the same brand name as gallo mentioned. no more ants after 2 days!
Thank you guys so much! You may have just saved my entire flock. My MIL wants to spray the whole backyard with ant killer but I will try these first. I really don't want to make my chickens sick or worse.
I'll let you know how it all works!